We work in the intersection between engineering, design, and technology where we help our clients throughout the entire journey – from the early project phase and through the entire life-cycle. Our complete palette of sound and vibration services enables us to create unique and optimal sound environments, reinforcing emotions and encouraging collaboration, concentration, play, and learning.
Our amazing team is always growing, learning, and sharing ideas to keep delivering the best for our clients and projects.
With hub offices in Sweden, Finland, Norway, Denmark, and the Netherlands we execute projects all around the globe, with the support of our colleagues at AFRY.
We’re a group of engineers, designers, and technical specialists delivering award-winning work in the Nordic region and worldwide since 1956. We create sound environments and solve vibration issues at all scales and in all sectors.
Make industrial processes more effective and prolong equipment lifespan, allowing us to contribute to a more sustainable world.
We create work environments that are suitable for their function, where the sound environment is not a complaint but a strength that allows for productivity, exchange of ideas as well as increased focus and well-being.
Create education environments where students can hear and understand the teachers and at the same time feel comfortable in the school environment.
Not focus solely on the goal of making products quieter, but also focus on making them sound right and go beyond client expectations.
Create hospital environments that allow patients to recover quicker, increasing the effectiveness and sustainability of the system.
Help preserve and enhance the sound environment in natural areas such as parks for recovery and recreation, thus enhancing the quality of life.
Create spaces where people can express themselves in different forms and at the same time allow for the masses to experience culture and events.
Protect animals from man-made noise and vibration and make sure the fauna remains unharmed.
Mitigate the negative effects of noise, with which we can help save lives by reducing noise-related adverse health impacts.
Introduce new and innovative uses of sound and vibration which make life easier and more accessible for disabled people.
Reduce noise disturbances in our homes to create better conditions for good sleep for the improvement of our health and well-being.
Raise awareness, understanding and increase knowledge on the topics of sound, noise and vibration through lectures, white papers, education and participation in workshops.
Our story begins in the 1950s in Gothenburg, Sweden, where the visionary Swedish engineer and professor Stig Ingemansson founded Ingemanssons Ingenjörsbyrå in 1956. Specializing in acoustic consultancy, the company quickly became a pioneer in noise mitigation solutions.
In 2006, the renowned Swedish engineering, consulting, and design company ÅF acquired Ingemanssons Ingenjörsbyrå. This marked a significant milestone as Stig Ingemansson’s legacy evolved, integrating the expertise of acousticians with consultants in energy, industry, infrastructure, and digital solutions.
The journey took another leap in 2019 when ÅF merged with Pöyry PLC, forming AFRY – a combined powerhouse of engineering and design expertise. To spotlight our dedication to acoustics, noise control, vibration management, and sound design, AFRY launched an endorsed brand: Efterklang – a name that reflects our passion for creating sound environments that inspire and elevate.
In 2020 Efterklang and AFRY acquired the Swedish sound design agency Lexter to further strengthen our position within sound design and audio branding.
In 2022, we expanded our presence in the Nordic market by welcoming new colleagues from the former Vahanen-Halme Acoustics, establishing a strong foothold in Finland.
Since our inception in 1956, we have delivered over 80,000 projects worldwide, spanning acoustics, noise control, and sound design. Our expertise has contributed to shaping both national and international standards, and we remain committed to pushing the boundaries of innovation in sound, vibration, and design.
